Ist it ok to plant in the evening?

I have a lot of planting to do and the only time I can count on a good couple of hours peace to do it is when the kids have gone to bed at 7pm. Do the plants need a lot of sunlight straight after being planted or can I get away with this?

As said above it can be the best time of day to plant, but not if your plants are dry. In your part of the country a bark area would be great for the kids to play on. You have to work on the backfill area.